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A128270 as a simple table

na(n)
12
21
3-3
44
5-3
612
7-3
848
9-3
10320
11-3
12512
13-135
14256
15-243
165120
17-243
188192
19-27
205120
21-27
222048
23-135
245120
25-1701
268192
27-2187
284096
29-2187
301024
31-6561
321792
33-1215
3425088
35-243
3662720
37-27
38313600
39-27
401568000
41-243
422508800
43-243
446272000

[2,1,-3,4,-3,12,-3,48,-3,320,-3,512,-135,256,-243,
 5120,-243,8192,-27,5120,-27,2048,-135,5120,-1701,
 8192,-2187,4096,-2187,1024,-6561,1792,-1215,25088,
 -243,62720,-27,313600,-27,1568000,-243,2508800,
 -243,6272000]